diff --git a/backend/app/checker.py b/backend/app/checker.py
index 907bc2c..8067b58 100644
--- a/backend/app/checker.py
+++ b/backend/app/checker.py
@@ -62,5 +62,15 @@ def check_results_for_draw(drw_no: int) -> int:
         
         update_recommendation_result(r["id"], rank, correct, has_bonus)
         count += 1
-        
+
+    # ── 구매 이력 체크 연동 ──────────────────────────────────────
+    try:
+        from .purchase_manager import check_purchases_for_draw as _check_purchases
+        purchase_count = _check_purchases(drw_no)
+        if purchase_count > 0:
+            from .strategy_evolver import recalculate_weights
+            recalculate_weights()
+    except ImportError:
+        pass  # purchase_manager 미설치 시 무시 (하위호환)
+
     return count
diff --git a/backend/tests/test_integration.py b/backend/tests/test_integration.py
new file mode 100644
index 0000000..c62a2da
--- /dev/null
+++ b/backend/tests/test_integration.py
@@ -0,0 +1,61 @@
+# backend/tests/test_integration.py
+"""checker.py → purchase_manager 연동 통합 테스트"""
+import sys, os
+import sqlite3
+
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "app"))
+
+import pytest
+from unittest.mock import patch
+
+
+def _make_mem_conn():
+    conn = sqlite3.connect(":memory:")
+    conn.row_factory = sqlite3.Row
+    return conn
+
+
+def test_check_results_triggers_purchase_check():
+    """check_results_for_draw가 purchase 체크도 트리거하는지 검증"""
+    import db
+    import backend.app.purchase_manager as pm
+
+    mem = _make_mem_conn()
+    with patch("db._conn", return_value=mem):
+        db.init_db()
+
+        # 당첨번호 삽입
+        mem.execute(
+            "INSERT INTO draws (drw_no, drw_date, n1, n2, n3, n4, n5, n6, bonus) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)",
+            (1124, "2026-03-28", 1, 2, 3, 4, 5, 6, 7)
+        )
+        mem.execute(
+            "INSERT INTO draws (drw_no, drw_date, n1, n2, n3, n4, n5, n6, bonus) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)",
+            (1125, "2026-04-04", 10, 20, 30, 35, 40, 44, 15)
+        )
+        mem.commit()
+
+        # 1125회차 대상 구매 등록
+        db.add_purchase(
+            draw_no=1125, amount=1000, sets=1,
+            numbers=[[10, 20, 30, 1, 2, 3]],
+            is_real=True, source_strategy="combined",
+        )
+
+    # purchase_manager의 check_purchases_for_draw��� 직접 호출하여 연동 검증
+    with patch("db._conn", return_value=mem), \
+         patch("backend.app.purchase_manager.get_draw", side_effect=lambda drw: db.get_draw(drw)), \
+         patch("backend.app.purchase_manager.get_purchases", side_effect=lambda **kw: db.get_purchases(**kw)), \
+         patch("backend.app.purchase_manager.update_purchase_results", side_effect=lambda *a, **kw: db.update_purchase_results(*a, **kw)), \
+         patch("backend.app.purchase_manager.upsert_strategy_performance", side_effect=lambda **kw: db.upsert_strategy_performance(**kw)):
+        purchase_count = pm.check_purchases_for_draw(1125)
+
+    assert purchase_count == 1
+
+    # purchase가 체크되었는지 확인
+    with patch("db._conn", return_value=mem):
+        purchases = db.get_purchases(draw_no=1125)
+    assert purchases[0]["checked"] == 1
+    assert purchases[0]["results"][0]["correct"] == 3  # 10, 20, 30 맞음
+
+    mem.close()